High-performance self-powered integrated system of pressure sensor and supercapacitor based on Cu@Cu2O/graphitic carbon layered porous structure

With the rapid development of human-machine technology, self-powered pressure sensor integrated systems have been extensively studied. However, there are only a few reports on such multifunctional devices using a single active material. In this work, we report a flexible integrated system, which consists of flexible pressure sensors and supercapacitors. Both of the devices were fabricated based on layered porous Cu@Cu2O/graphitic carbon (Cu@Cu2O/GC) composites, which were obtained by a one-step simple polymer heat treatment method. Due to the discontinuous conductive paths and effective stress concen-tration relief in the composite, the pressure sensor shows a high sensitivity of 90 kPa(-1) in a wide working range of 0-150 kPa, a fast response time of 90 ms, and a detection limit of 2.4 Pa. Moreover, the layered porous structure Cu@Cu2O/GC can not only maintain the integrity of the electrode material, but also pro-mote the diffusion of electrons, enabling super capacitors to obtain excellent electrochemical perfor-mance. The specific capacitance of the super capacitor is 17.8 mF cmz. More importantly, the flexible self-powered integrated system could be directly attached to the human body to detect human motions, showing its great potential application in wearable devices.(c) 2022 Elsevier Inc. All rights reserved.